Ключевые слова: angry, bad, business, choice, choose, client, concept, consumer, customer, emoticon, emotion, evaluation, excellent, expression, face, feedback, good, hand, happiness, happy, icon, level, life events, like, marketing, mood, negative, opinion, paper, positive, product, quality, questionnaire, rank, rating, review, sad, satisfaction, scale, service, sign, smile, smiley, survey, symbol, test, unhappy, user, vote,